121220123311320 has 192 divisors, whose sum is σ = 399747477024000. Its totient is φ = 29385107431680.

The previous prime is 121220123311319. The next prime is 121220123311369. The reversal of 121220123311320 is 23113321022121.

It is a super-2 number, since 2×121220123311320² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 280295811 + ... + 280727949.

It is an arithmetic number, because the mean of its divisors is an integer number (2082018109500).

Almost surely, 2^{121220123311320} is an apocalyptic number.

121220123311320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121220123311320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199873738512000).

121220123311320 is an abundant number, since it is smaller than the sum of its proper divisors (278527353712680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121220123311320 is a wasteful number, since it uses less digits than its factorization.

121220123311320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451494 (or 451479 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 121220123311320 its reverse (23113321022121), we get a palindrome (144333444333441).

The spelling of 121220123311320 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-three million, three hundred eleven thousand, three hundred twenty".